Okay, so my parents bought me a trio of Muscovies quite a few months back. I think they are broken. The drake almost never mates the girls. I have seen him attempt to mate one of the hens precisely once since I got them and he failed.
The girls don't sit. Well, one of them did, but 3 of her 7 babies died of unknown causes. The other doesn't even think about it. And even if she did, I don't think her eggs would even be fertile! My parents are not happy about buying feed for them because they are not doing anything useful. They were keeping the fly population down pretty well, but they aren't even doing that now.
No eggs, almost no bug control, almost no babies. What the heck? Does anyone have suggestions? Because if they don't start doing something they are gonna have to go. I read all about how muscovie ducks were supposed to be this great homesteading bird. Like I said, I think mine are broken.

